Here’s a column on reforming the payroll tax that I wrote in NYTimes Economix today:

Payroll taxes and corporate income taxes accounted for an equal share of federal tax revenue in 1969. By 2009, payroll taxes generated more than six times as much revenue. We’ve become reliant on payroll taxes, and a goal of a tax overhaul should be to reform and reduce them, permanently.

First, some background. The share of federal tax revenues coming from payroll taxes has doubled since the 1970s, to about two-fifths of revenue. The payroll tax, underwriting social insurance programs, nearly surpassed the individual income tax as the single largest source of federal tax revenue in 2009.

Source: Office of Management and Budget Historical Table 2.2

Since payroll taxes finance Social Security and part of Medicare, cost growth in these programs pressures policy makers to raise those taxes. In particular, pressure from the Social Security disability insurance program and Medicare Part A has been intensifying.

Pressure on the payroll tax from Medicare Part A is even worse. Health cost growth has steadily outpaced inflation, and the pattern shows no sign of abating. Fundamental economic forces – such as Baumol’s cost disease, which describes the phenomenon of rising costs in industries less conducive to automation – will most likely continue to increase health care costs steadily.

The primary argument for severing the link between these growing programs and the payroll taxes is that the tax is regressive: It uses a flat rate on incomeup to $110,100, does not apply to most income above that threshold and does not apply to nonlabor income, like capital gains. Because of this relatively regressive nature, payroll tax cuts tend to be a more effective stimulus than typical income tax cuts – and thus are a more effective way for Washington to respond to recessions.

Despite these features, AARP and other groups often resist payroll tax cuts out of a fear that the cuts will undermine the future of the safety net (even though the cuts are fully paid for out of general revenue). Permanently breaking the link between payroll taxes and both disability and Medicare would allow the tax code to become more progressive – and do more to offset inequality – without creating political problems when the business cycle calls for fiscal stimulus.

Obviously, the government would need other revenue if it severed the link between payroll taxes and the safety-net programs. One option would be to limit tax breaks, as Congress and the Obama administration have recently discussed. Others include phasing in a carbon tax, raising top marginal rates slightly or overhauling the tax code to use a progressive consumption tax that encourages saving.

The country is almost certain to face higher costs for health care and for an aging work force whose skills are being outpaced by technology. But there is no reason those costs must be borne by a regressive tax vulnerable to recurring struggles over economic policy.

About

I'm an Assistant Professor of Economics at the University of Chicago Booth School of Business and a Faculty Research Fellow at National Bureau of Economic Research (NBER) in the Public economics group. You can follow me on twitter @omzidar.